[ANALYZER-1595] Visualizations need to handle null/missing/NaN/NA Measure values consistently when used as size by and color by values.
[ANALYZER-1660] Visualizations need to handle negative Measure values consistently when used as size by and color by values.
Still not updating the properties panel when negative values exist.
Merge pull request #9 from webdetails/master

ANALYZER-1716, ANALYZER-1595 and ANALYZER-166